共查询到18条相似文献,搜索用时 171 毫秒
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介绍了土-结相互作用的研究概况,进一步讨论了在建筑结构设计时考虑动力相互作用和静力相互作用的必要性.借助大型有限元程序ANSYS,建立了框架结构-独立基础-地基的共同作用模型,解决了应用ANSYS对框架结构-独立基础-地基进行空间分析的技术问题,为进行土-结动力、静力相互作用分析提供了一个可行的方法.通过实例计算分析,研究了考虑框架结构-基础-地基共同作用的设计方法较常规设计方法对上部结构内力的影响规律,对进一步完善结构设计具有一定的工程意义. 相似文献
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密肋壁板结构作为一种新型的结构体系,结合工程实例,利用有限元软件ANSYS,主要研究筏板基础与密肋壁板结构及地基土相互作用中的工作性状,提出了考虑结构-筏板-地基土相互作用的设计建议. 相似文献
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研究了目前结构设计中存在的问题,分析了结构设计时考虑上部结构-基础-地基相互作用的必要性,提出了考虑结构-基础-地基相互作用的结构设计新方法,预测了结构设计方法的发展趋势,并做了可行的尝试. 相似文献
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结构-地基开放系统动力相互作用问题的高效解法 总被引:8,自引:0,他引:8
应用黏弹性人工边界将结构-地基开放系统转化为近似的封闭系统,利用等效地震波动输入方法将波动散射问题化为波源问题,再采用振型叠加法对近似封闭系统进行分析,由此建立了一种结构-地基开放系统动力反应问题的高效计算方法。采用高效算法分别计算了二维弹性半空间波源问题和地震作用下结构-地基动力相互作用问题算例,并与采用常规的直接时域逐步积分法给出的计算结果进行了对比,由此讨论了高效算法的特点。与常规直接动力分析方法相比,高效算法可以在确保模拟精度的同时,有效降低计算工作量、节省计算时间,并且结构-地基动力相互作用系统的模型越大、自由度越多,高效算法的优越性就越突出,从而为大型结构-地基系统动力相互作用问题数值分析提供了一种高效而精度足够的解法。 相似文献
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由于无限地基的动力效应较难确定,结构-地基的动力相互作用主要局限于频域分析,从而限制了非线性分析应用。阻尼抽取法(DSEM)通过在有限域内施以附加人工阻尼再移频抽取的办法可以有效地模拟非均匀无限粘弹性介质的动力特性,在结构-无限地基动力相互作用分析中有较好的应用前景。在此基础上,本文提出了DSEM进行结构-地基交界面相互作用力-位移时域分析的有限元逐步积分形式算法,并给出了具体实现公式,可以更好地适应工程有限元计算及与结构-地基相互作用程序结合的需要。最后,以实例形式论述了该方法良好的精度及实现中各个关键因素的影响。 相似文献
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基于刚性地基假定的工程结构抗震计算方法未充分考虑场地土对结构地震反应的影响.为验证土-结构相互作用对高层建筑三维地震反应的影响,本文针对某双塔高层建筑,分别建立了单塔上部结构、双塔整体结构以及土-结构相互作用共同工作三维有限元模型.研究对比了各结构体系的动力特性,并通过地震弹性时程反应分析法进行了结构体系三维地震反应分... 相似文献
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上部结构-基础-地基之间相互作用和共同工作问题的研究长期以来是土木建筑工程中非常重要的课题之一.本文采用ANSYS10.0,建立了九层框架结构、筏基和土体共同作用的有限元模型,通过数值模拟计算,比较了共同作用的分析方法与常规计算方法的结果,揭示出结构体系三部分间的相互作用影响和内在联系,研究了地基沉降和基底反力的空间分布,以及基础和上部结构的内力重分布规律,为改进实际结构设计的安全、经济性提供依据. 相似文献
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Liu Jingbo Gu Yin Li Bin Wang Yan 《Frontiers of Architecture and Civil Engineering in China》2007,1(3):340-345
The structure-foundation system is transformed from an original open system into an approximately hermetic system through
a viscous-spring artificial boundary. In addition, the seismic wave scattering problem is changed to a wave source problem
by employing an equivalent seismic wave input method. Subsequently, the modal superposition method is adopted to solve the
approximated hermetic system. This procedure is highly efficient in analyzing dynamic structure-foundation interaction problems
in the time domain. Two numerical examples are presented to illustrate the characteristics of the proposed method: one is
a wave source problem in 2-dimensions (2-D) elastic semi-infinite space, and the other is a dynamic structure-foundation interaction
problem under seismic excitations. Compared with the traditional direct step-by-step integration method, the proposed method,
with a sufficient number of modes included, can significantly reduce the computational time with almost the same precision.
The results also indicate that the proposed method is more advantageous for solving large structure-foundation systems of
many degrees of freedom.
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Translated from China Civil Engineering Journal, 2006, 39(5): 112–116 [译自: 土木工程学报] 相似文献
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对结构与地基介质相互作用分析中地基无限远区提出了一种解析解模拟方法,这一方法相比于现有人工边界及无限单元方法,既可反映无限介质特性,又不需增加任何计算工作量,具有简便、精确的特点,便于工程应用。 相似文献
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Based on the reduced set of base function in scaled boundary finite element method (SBFEM), an improved time domain numerical approach for the dynamic structure-foundation interaction analysis was proposed. With reasonable choice of the number of base functions, the degrees of freedom on the structure-foundation interface were reduced and the associated computation for the calculation of convolution integral was greatly reduced. The results of this proposed approach applied to the calculation of a gravity dam and an arch dam. The acceleration frequency response functions were calculated and the influences affected by different reduced set of base functions as well as full set were compared. It was found that a higher degree of reduced set of base functions resulted in a significant increase of computational efficiency but a little bit of loss in accuracy. When the reduced set was decreased by 60%, the efficiency may be increased to up to five times, while the loss of accuracy of peak value of response will be less than 4%. It may be concluded that the proposed approach is suitable for large-scale structure-foundation interaction analysis. 相似文献
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Based on the reduced set of base function in scaled boundary finite element method (SBFEM), an improved time domain numerical
approach for the dynamic structure-foundation interaction analysis was proposed. With reasonable choice of the number of base
functions, the degrees of freedom on the structure-foundation interface were reduced and the associated computation for the
calculation of convolution integral was greatly reduced. The results of this proposed approach applied to the calculation
of a gravity dam and an arch dam. The acceleration frequency response functions were calculated and the influences affected
by different reduced set of base functions as well as full set were compared. It was found that a higher degree of reduced
set of base functions resulted in a significant increase of computational efficiency but a little bit of loss in accuracy.
When the reduced set was decreased by 60%, the efficiency may be increased to up to five times, while the loss of accuracy
of peak value of response will be less than 4%. It may be concluded that the proposed approach is suitable for large-scale
structure-foundation interaction analysis.
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Translated from Shuili Xuebao, 2007, 38 (1): 8–14 [译自: 水利学报] 相似文献
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本文首次将模拟地基的映射动力无穷元与有限元耦合模型应用于框剪结构-地基系统的动力相互作用分析中.分析了E_g/E_s,H/L等参数对上述动力耦合系统相互作用的影响,得出了一些有益的结论. 相似文献
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Nishant SHARMA Kaustubh DASGUPTA Arindam DEY 《Frontiers of Structural and Civil Engineering》2020,14(1):62
This article describes a novel approach for deciding optimal horizontal extent of soil domain to be used for finite element based numerical dynamic soil structure interaction (SSI) studies. SSI model for a 12 storied building frame, supported on pile foundation-soil system, is developed in the finite element based software framework, OpenSEES. Three different structure-foundation configurations are analyzed under different ground motion characteristics. Lateral extent of soil domain, along with the soil properties, were varied exhaustively for a particular structural configuration. Based on the reduction in the variation of acceleration response at different locations in the SSI system (quantified by normalized root mean square error, NRMSE), the optimum lateral extent of the soil domain is prescribed for various structural widths, soil types and peak ground acceleration levels of ground motion. Compared to the past studies, error estimation analysis shows that the relationships prescribed in the present study are credible and more inclusive of the various factors that influence SSI. These relationships can be readily applied for deciding upon the lateral extent of the soil domain for conducting precise SSI analysis with reduced computational time. 相似文献
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采用梁单元-有限元-映射动力无穷元耦合的方法,建立了频域中框架结构与半无限地基系统动力相互作用问题的分析模型,探讨了结构与地基动力相互作用对该系统的动力特性和地震响应的影响及影响参数.得到了一些规律性的结果和有益的结论,可为工程抗震设计提供参考. 相似文献